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scilab 2.6-4
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UNOBS            Scilab Group            Scilab Function              UNOBS
NAME
   unobs - unobservable subspace
  
CALLING SEQUENCE
 [n,[U]]=unobs(A,C,[tol]) 
PARAMETERS
 A, C   : real matrices 
        
 tol    : tolerance used when evaluating ranks (QR factorizations).
        
 n      : dimension of unobservable subspace.
        
 U      : orthogonal change of basis which puts (A,B) in canonical form.
        
DESCRIPTION
   [n,[U]]=unobs(A,C,[tol]) gives the unobservable form of an (A,C)  pair.
  The n first columns of U make a basis for the unobservable subspace.
  
   The (2,1) block (made of last nx-n rows and n first  columns) of U'*A*U
  is zero and and the n first columns  of C*U are zero.
  
EXAMPLE
 A=diag([1,2,3]);C=[1,0,0];
 unobs(A,C)
SEE ALSO
   contr, contrss, canon, cont_mat, spantwo, dt_ility